arsenic trioxide: Meaning and Definition of

ar'senic triox'ide

Pronunciation: [key]
— Chem. Chem.
  1. a white, tasteless, amorphous, slightly water-soluble, poisonous powder, AsO, used chiefly in the manufacture of pigments and glass and as an insecticide or weed-killer; arsenous acid. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.